how to execute java functions in xslt

Question

I am trying to get the date using java namespace in XSLT file, and minus X no of days from it. How to minus days from from date in xslt?

I tried using java namespace to get the current date and use the java.time.LocalDate.now().minusDays(2) the days. It works fine in java but in xslt it fails

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
                              xmlns:xs="http://www.w3.org/2001/XMLSchema"
                              xmlns:java="http://xml.apache.org/xslt/java" 
                              xmlns:xalan="http://xml.apache.org/xalan"
                              xmlns:fn="http://www.w3.org/2005/xpath-functions"
                              xmlns:datetime="http://exslt.org/dates-and-times"
                              xmlns:math="http://exslt.org/math"
                              xmlns:date="http://www.date.org/"
                              xmlns:exslt="http://exslt.org/common"
                              xmlns:js="javascript:code"
                              exclude-result-prefixes="java"
                              extension-element-prefixes="mcr">

    <xsl:variable name="test" select="java:java.time.LocalDate.now().minusDays(2)"/>

when I am using only "java:java.time.LocalDate.now()" in select, I am getting today's date as output. Only the minusDays() function doesn't seem to work.

I am expecting an output which is currentDate minus 2 days in yyyy-MM-dd format. Ex : if today's Date is 12 June, 2019 OUTPUT : 2019-06-10

"it fails" is not a good description of problem. And Java is not part of XSLT. If your processor happens to support it, there may be limits to that support. — michael.hor257k
– michael.hor257k, Commented Jun 12, 2019 at 11:02

Michael Kay · Accepted Answer · 2019-06-12 13:10:52Z

1

This is a valid XPath function call: java:java.time.LocalDate.now(), which Xalan interprets as a call on an external Java static method.

You then follow this with ".". But "." is not a valid operator in XPath. If you want to apply one XPath function F() to the result of another function G(), you can't use the Java syntax F().G(), you have to use the XPath syntax G(F()). And that means you'll need to use the fully-qualified function name corresponding to minusDays().

Since you're in Java, you could switch to Saxon, which supports all the date-and-time functions built in to XSLT 2.0, so all this calling out to Java for simple date/time arithmetic becomes unnecessary.

answered Jun 12, 2019 at 13:10

Michael Kay

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